Bug or new feature?

[Strider]

When you choose TFs from another base than the one your Invasion fleet is leaving from, I think it classifies that TF as a Raid, even tho it will participate in the Invasion, thus it will return to it's original base.
The Invasion TF itself, I think that maybe, if any one single ship is too large for the base to accomodate, then the entire Invasion TF will return???? Not sure if it still happens, but I thought that sometimes my Invasion TF that couldn't base at the island it was attacking, would sometimes 'scatter' to other bases, instead of the entire TF staying together, and even ships would be seperated from the original TF upon returning to the original base???